“As regards moral courage, then, it is not so much that the public schools support it feebly, as that they suppress it firmly.”

“Very much indeed of what we call moral education is such an artificial modification and perversion of instinct; pugnacity is trained into courageous self-sacrifice, and suppressed sexuality into religious emotion.”

“Deep down, below the surface of the average man's conscience, he hears a voice whispering, "There is something not right," no matter how much his rightness is supported by public opinion or moral code.”

“Courage becomes a worthwhile and meaningful virtue when it is regarded not so much as a willingness to die manfully but as a determination to live decently.”

“It is curious that physical courage should be so common in the world and moral courage so rare.”

“The public has a distorted view of science because children are taught in school that science is a collection of firmly established truths. In fact, science is not a collection of truths. It is a continuing exploration of mysteries.”